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Topological Modification Method of Cylindrical Gears

A technology of cylindrical gears, gears, applied in the direction of elements with teeth, belts/chains/gears, gear teeth, etc.

Active Publication Date: 2017-01-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional processing methods are difficult to use the same tool to process gears with different modified shapes

Method used

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  • Topological Modification Method of Cylindrical Gears
  • Topological Modification Method of Cylindrical Gears
  • Topological Modification Method of Cylindrical Gears

Examples

Experimental program
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Embodiment Construction

[0032] The present invention is described below in conjunction with concrete processing example:

[0033] Using worm grinding wheel grinding technology to process helical cylindrical gears, processed gear parameters: normal pressure angle α n2 =27.5°, normal modulus m n2 =3, number of teeth Z 2 =27, helix angle β 2 =18°, right-handed, addendum height ha 2 =2.527, dedendum height hf 2 = 3.75. Parameters of worm-shaped grinding wheel: normal pressure angle α n1 =27.5°, normal modulus m n1 = 3, number of heads Z 1 =4, helix angle γ 1 =8°, right-handed, addendum height ha 1 =3.8, dedendum height hf 1 = 3.75. Shaft intersection angle λ=100°, center distance a=85.696.

[0034] The steps of the cylindrical gear modification method are as follows:

[0035] 1. in figure 1 In the coordinate system shown, the tooth surface models of the worm-shaped grinding wheel and the modified gear are respectively established:

[0036] r → ...

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Abstract

The invention discloses a topology shape correcting method for a cylindrical gear, and belongs to the field of the gear mechanical manufacture. Based on the gear geometry, the invention provides a method for performing drum shape correction in the cylindrical gear by controlling rotate speed of processed gear. The method is suitable for the processing method for a tool using the tooth profile as the gradually opening spiral surface, comprising the steps of hobbing, shaving, worm grinding wheel gear grinding and external gearing gear lapping. The same tool can process the gear of which the normal modulus and the normal pressure angle are the same, but the correcting shapes are different. Through enabling the overlap ratio in the meshing process to be less than 1, the rotate speed of the tool and the feed speed are maintained, only the rotate speed of the processed gear is controlled, and the full tooth surface topology shape correction can be achieved.

Description

technical field [0001] The invention relates to a method for topologically modifying cylindrical gears, belonging to the field of gear machinery manufacturing. Background technique [0002] Gear is an important basic transmission part, and its development is developing in the direction of high precision, low noise, heavy load and light weight. During the transmission process of the standard involute helical gear, due to the action of the load, there will be a certain deformation, which will reduce the transmission accuracy of the gear pair during the movement and cause noise. In practical applications, in order to improve the reduction of transmission accuracy caused by load deformation during the transmission process, it is necessary to carry out specific center drum modification on the gear tooth surface to make the transmission more stable after deformation. [0003] There are two main methods of gear modification. There are two main ways to achieve gear modification: on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23F5/00
Inventor 石照耀于渤林家春
Owner BEIJING UNIV OF TECH